/ 2 \
| 3*x |
|-1 + ------|*cosh(x)
| 2|
3*cosh(x) \ 1 + x / 3*x*sinh(x)
asinh(x)*sinh(x) + ----------- + --------------------- - -----------
________ 3/2 3/2
/ 2 / 2\ / 2\
\/ 1 + x \1 + x / \1 + x /
$$- \frac{3 x \sinh{\left(x \right)}}{\left(x^{2} + 1\right)^{\frac{3}{2}}} + \sinh{\left(x \right)} \operatorname{asinh}{\left(x \right)} + \frac{3 \cosh{\left(x \right)}}{\sqrt{x^{2} + 1}} + \frac{\left(\frac{3 x^{2}}{x^{2} + 1} - 1\right) \cosh{\left(x \right)}}{\left(x^{2} + 1\right)^{\frac{3}{2}}}$$